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June 17th, 2026 :: 9:38 am CDT   

Local Weather Report for
Decatur
Illinois, United States

 Current Decatur Weather Conditions Updated June 17th at 8:54 am 
Temperature:66°F Dew Point:52°F
Barometer:29.59 inHg Wind:N 26 Mph
Humidity:59.7% Visibility:0M
 
 Decatur Weather Forecast Summary  
 
Today
Jun 17th
Thursday
Jun 18th
Friday
Jun 19th
Saturday
Jun 20th
Sunday
Jun 21st
Thundershowers Mostly Sunny Mostly Sunny Mix of Cloud and Sun Rain
81°F
73°F
60°F
75°F
56°F
74°F
62°F
64°F
57°F
 
 Decatur Detailed Weather Forecast  
 
Wednesday, June 17th, 2026
Morning Temperature: 64°F
Sunny with cloudy periods. Windy at times.
Afternoon Temperature: 80°F
Mostly cloudy with a chance of showers or thundershowers. Wind 20 to 30 mph.
Evening Temperature: 75°F
Clear with showers likely. Chance of a thunderstorm. Wind 20 to 30 mph.
Thursday, June 18th, 2026
Overnight Temperature: 64°F
Clear with a slight chance of showers. Windy at times.
Morning Temperature: 63°F
A mix of cloud and sun. Windy at times.
Afternoon Temperature: 71°F
A mix of cloud and sun. Windy at times.
Evening Temperature: 65°F
Clear.
Friday, June 19th, 2026
Overnight Temperature: 57°F
Clear.
Morning Temperature: 64°F
Sunny.
Afternoon Temperature: 75°F
Mostly sunny. Windy at times.
Evening Temperature: 67°F
Mostly clear.
Saturday, June 20th, 2026
Overnight Temperature: 63°F
A mix of cloudy and clear skies.
Morning Temperature: 63°F
Mostly cloudy.
Afternoon Temperature: 69°F
A mix of cloud and sun.
Evening Temperature: 70°F
Clear with cloudy periods.
Sunday, June 21st, 2026
Overnight Temperature: 63°F
Mostly cloudy with showers likely.
Morning Temperature: 61°F
Cloudy with heavy rain. Windy.
Afternoon Temperature: 61°F
Mostly cloudy with rain, at times heavy. Windy.
Evening Temperature: 60°F
Clear with a slight chance of showers. Windy at times.
Monday, June 22nd, 2026
Overnight Temperature: 49°F
Clear.
Morning Temperature: 57°F
Sunny.
Afternoon Temperature: 70°F
Mostly sunny.
Evening Temperature: 64°F
Mostly clear.
Tuesday, June 23rd, 2026
Overnight Temperature: 56°F
Clear.
Morning Temperature: 63°F
Sunny.
Afternoon Temperature: 73°F
A mix of cloud and sun.
Evening Temperature: 66°F
Mostly clear.
Wednesday, June 24th, 2026
Overnight Temperature: 58°F
Clear.
Morning Temperature: 65°F
Sunny.
Afternoon Temperature: 76°F
Sunny with cloudy periods.
Evening Temperature: 72°F
A mix of clear and cloudy skies.
Thursday, June 25th, 2026
Overnight Temperature: 63°F
Clear.
Morning Temperature: 69°F
Mostly sunny. Windy at times.
Afternoon Temperature: 80°F
Sunny with cloudy periods. Slight chance of a thunderstorm. Windy at times.
Evening Temperature: 73°F
Clear. Chance of a thunderstorm. Windy at times.





 

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This WeatherCity Weather Forecast for Decatur, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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